編輯：初級開發
歡迎閱讀本文，你能關注本文，你知道你需要進程間通信、需要AIDL（以及Binder），那麼可以默認你對這些概念已經有了一些了解，你（大致）知道它們是什麼，它們有什麼用，所以為了節約大家的眼力和時間，在此我不復制粘貼網上泛濫的博客或者翻譯冗長的android文檔。
關於AIDL的介紹在文檔：docs/guide/developing/tools/aidl.Html
關於IBinder的介紹在文檔：docs/reference/android/os/IBinder.Html
以及Binder：docs/reference/android/os/Binder.Html
在後文中，我將以我自己的理解向你介紹相關的概念。以我目前粗淺的經驗，應用程序使用AIDL的地方，幾乎都和Service有關，所以你也需要知道一些關於Service的知識。日後得閒我也會繼續寫一些關於Service的貼。
本文將以一個例子來和你分享使用AIDL的基礎技能，這個例子裡有：
1、一個類mAIDLActivity，繼承Activity。裡面有三個按鈕，text分別為StartService，StopService，CallbackTest。
2、一個類mAIDLService，繼承Service。為了充分展示ADIL的功能，它做以下工作：當用戶點擊CallbackTest按鈕時，從mAIDLActivity調用mAIDLService中的Stub 對象的一個方法invokCallBack()，而這個方法又會調用mAIDLActivity中Stub 對象的一個方法perforMaction()，這個方法在屏幕上顯示一個toast。沒什麼意義，只是展示一下AIDL如何使用。
3、兩個AIDL文件：forService.aidl和forActivity.aidl。對應名字，在Service和Activity中分別有對象需要用到它們定義的接口。
4、相關XML文件，略過。關於manifest中Service的語法，見docs/guide/topics/manifest /service-element.Html。你也可以簡單地在<application></application>中加入
<service android:name=".mAIDLService" android:process=":remote"> </service>
開發環境為Eclipse。
揀重要的先說，來看看aidl文件的內容：
文件：forActivity.aidl
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01.package com.styleflying.AIDL;
02.interface forActivity {
03. void perforMaction();
04. }
vIEw plaincopy to clipboardprint?
01.package com.styleflying.AIDL;
02.interface forActivity {
03. void perforMaction();
04. }
package com.styleflying.AIDL;
interface forActivity {
void perforMaction();
}
文件：forService.aidl
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01.package com.styleflying.AIDL;
02.import com.styleflying.AIDL.forActivity;
03.interface forService {
04. void registerTestCall(forActivity cb);
05. void invokCallBack();
06.}
vIEw plaincopy to clipboardprint?
01.package com.styleflying.AIDL;
02.import com.styleflying.AIDL.forActivity;
03.interface forService {
04. void registerTestCall(forActivity cb);
05. void invokCallBack();
06.}
package com.styleflying.AIDL;
import com.styleflying.AIDL.forActivity;
interface forService {
void registerTestCall(forActivity cb);
void invokCallBack();
}
這兩個文件和Java文件放置的地方一樣，看包名。
在Eclipse中它們將被自動編譯為forActivity.java和forService.Java，它們存放在gen目錄下。為了方便手頭無法演練的讀者，代碼貼上，不用細看。
文件forActivity.Java：
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01./*
02. * This file is auto-generated. DO NOT MODIFY.
03. * Original file: D:\\workspace\\AIDLTest\\src\\com\\styleflying\\AIDL\\forActivity.aidl
04. */
05.package com.styleflying.AIDL;
06.import Java.lang.String;
07.import android.os.RemoteException;
08.import android.os.IBinder;
09.import android.os.IInterface;
10.import android.os.Binder;
11.import android.os.Parcel;
12.public interface forActivity extends android.os.IInterface
13.{
14./** Local-side IPC implementation stub class. */
15.public static abstract class Stub extends android.os.Binder implements com.styleflying.AIDL.forActivity
16.{
17.private static final Java.lang.String DESCRIPTOR = "com.styleflying.AIDL.forActivity" ;
18./** Construct the stub at attach it to the interface. */
19.public Stub()
20.{
21.this .attachInterface( this , DESCRIPTOR);
22.}
23./**
24. * Cast an IBinder object into an forActivity interface,
25. * generating a proxy if needed.
26. */
27.public static com.styleflying.AIDL.forActivity asInterface(android.os.IBinder obj)
28.{
29.if ((obj== null )) {
30.return null ;
31.}
32.android.os.IInterface iin = (android.os.IInterface)obj.queryLocalInterface(DESCRIPTOR);
33.if (((iin!= null )&&(iin instanceof com.styleflying.AIDL.forActivity))) {
34.return ((com.styleflying.AIDL.forActivity)iin);
35.}
36.return new com.styleflying.AIDL.forActivity.Stub.Proxy(obj);
37.}
38.public android.os.IBinder asBinder()
39.{
40.return this ;
41.}
42.@Override public boolean onTransact( int code, android.os.Parcel data, android.os.Parcel reply, int flags) throws android.os.RemoteException
43.{
44.switch (code)
45.{
46.case INTERFACE_TRANSACTION:
47.{
48.reply.writeString(DESCRIPTOR);
49.return true ;
50.}
51.case TRANSACTION_perforMaction:
52.{
53.data.enforceInterface(DESCRIPTOR);
54.this .perforMaction();
55.reply.writeNoException();
56.return true ;
57.}
58.}
59.return super .onTransact(code, data, reply, flags);
60.}
61.private static class Proxy implements com.styleflying.AIDL.forActivity
62.{
63.private android.os.IBinder mRemote;
64.Proxy(android.os.IBinder remote)
65.{
66.mRemote = remote;
67.}
68.public android.os.IBinder asBinder()
69.{
70.return mRemote;
71.}
72.public Java.lang.String getInterfaceDescriptor()
73.{
74.return DESCRIPTOR;
75.}
76.public void perforMaction() throws android.os.RemoteException
77.{
78.android.os.Parcel _data = android.os.Parcel.obtain();
79.android.os.Parcel _reply = android.os.Parcel.obtain();
80.try {
81._data.writeInterfaceToken(DESCRIPTOR);
82.mRemote.transact(Stub.TRANSACTION_perforMaction, _data, _reply, 0 );
83._reply.readException();
84.}
85.finally {
86._reply.recycle();
87._data.recycle();
88.}
89.}
90.}
91.static final int TRANSACTION_perforMaction = (IBinder.FIRST_CALL_TRANSACTION + 0 );
92.}
93.public void perforMaction() throws android.os.RemoteException;
94.}
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01./*
02. * This file is auto-generated. DO NOT MODIFY.
03. * Original file:
04.D:\\workspace\\AIDLTest\\src\\com\\styleflying\\AIDL\\forActivity.aidl
05. */
06.package com.styleflying.AIDL;
07.import Java.lang.String;
08.import android.os.RemoteException;
09.import android.os.IBinder;
10.import android.os.IInterface;
11.import android.os.Binder;
12.import android.os.Parcel;
13.public interface forActivity extends android.os.IInterface
14.{
15./** Local-side IPC implementation stub class. */
16.public static abstract class Stub extends android.os.Binder implements
17.com.styleflying.AIDL.forActivity
18.{
19.private static final Java.lang.String DESCRIPTOR =
20."com.styleflying.AIDL.forActivity";
21./** Construct the stub at attach it to the interface. */
22.public Stub()
23.{
24.this.attachInterface(this, DESCRIPTOR);
25.}
26./**
27. * Cast an IBinder object into an forActivity interface,
28. * generating a proxy if needed.
29. */
30.public static com.styleflying.AIDL.forActivity
31.asInterface(android.os.IBinder obj)
32.{
33.if ((obj==null)) {
34.return null;
35.}
36.android.os.IInterface iin =
37.(android.os.IInterface)obj.queryLocalInterface(DESCRIPTOR);
38.if (((iin!=null)&&(iin instanceof
39.com.styleflying.AIDL.forActivity))) {
40.return ((com.styleflying.AIDL.forActivity)iin);
41.}
42.return new com.styleflying.AIDL.forActivity.Stub.Proxy(obj);
43.}
44.public android.os.IBinder asBinder()
45.{
46.return this;
47.}
48.@Override public boolean onTransact(int code, android.os.Parcel data,
49.android.os.Parcel reply, int flags) throws android.os.RemoteException
50.{
51.switch (code)
52.{
53.case INTERFACE_TRANSACTION:
54.{
55.reply.writeString(DESCRIPTOR);
56.return true;
57.}
58.case TRANSACTION_perforMaction:
59.{
60.data.enforceInterface(DESCRIPTOR);
61.this.perforMaction();
62.reply.writeNoException();
63.return true;
64.}
65.}
66.return super.onTransact(code, data, reply, flags);
67.}
68.private static class Proxy implements com.styleflying.AIDL.forActivity
69.{
70.private android.os.IBinder mRemote;
71.Proxy(android.os.IBinder remote)
72.{
73.mRemote = remote;
74.}
75.public android.os.IBinder asBinder()
76.{
77.return mRemote;
78.}
79.public Java.lang.String getInterfaceDescriptor()
80.{
81.return DESCRIPTOR;
82.}
83.public void perforMaction() throws android.os.RemoteException
84.{
85.android.os.Parcel _data = android.os.Parcel.obtain();
86.android.os.Parcel _reply = android.os.Parcel.obtain();
87.try {
88._data.writeInterfaceToken(DESCRIPTOR);
89.mRemote.transact(Stub.TRANSACTION_perforMaction, _data, _reply, 0);
90._reply.readException();
91.}
92.finally {
93._reply.recycle();
94._data.recycle();
95.}
96.}
97.}
98.static final int TRANSACTION_perforMaction =
99.(IBinder.FIRST_CALL_TRANSACTION + 0);
100.}
101.public void perforMaction() throws android.os.RemoteException;
102.}
/*
* This file is auto-generated. DO NOT MODIFY.
* Original file:
D:\\workspace\\AIDLTest\\src\\com\\styleflying\\AIDL\\forActivity.aidl
*/
package com.styleflying.AIDL;
import Java.lang.String;
import android.os.RemoteException;
import android.os.IBinder;
import android.os.IInterface;
import android.os.Binder;
import android.os.Parcel;
public interface forActivity extends android.os.IInterface
{
/** Local-side IPC implementation stub class. */
public static abstract class Stub extends android.os.Binder implements
com.styleflying.AIDL.forActivity
{
private static final Java.lang.String DESCRIPTOR =
"com.styleflying.AIDL.forActivity";
/** Construct the stub at attach it to the interface. */
public Stub()
{
this.attachInterface(this, DESCRIPTOR);
}
/**
* Cast an IBinder object into an forActivity interface,
* generating a proxy if needed.
*/
public static com.styleflying.AIDL.forActivity
asInterface(android.os.IBinder obj)
{
if ((obj==null)) {
return null;
}
android.os.IInterface iin =
(android.os.IInterface)obj.queryLocalInterface(DESCRIPTOR);
if (((iin!=null)&&(iin instanceof
com.styleflying.AIDL.forActivity))) {
return ((com.styleflying.AIDL.forActivity)iin);
}
return new com.styleflying.AIDL.forActivity.Stub.Proxy(obj);
}
public android.os.IBinder asBinder()
{
return this;
}
@Override public boolean onTransact(int code, android.os.Parcel data,
android.os.Parcel reply, int flags) throws android.os.RemoteException
{
switch (code)
{
case INTERFACE_TRANSACTION:
{
reply.writeString(DESCRIPTOR);
return true;
}
case TRANSACTION_perforMaction:
{
data.enforceInterface(DESCRIPTOR);
this.perforMaction();
reply.writeNoException();
return true;
}
}
return super.onTransact(code, data, reply, flags);
}
private static class Proxy implements com.styleflying.AIDL.forActivity
{
private android.os.IBinder mRemote;
Proxy(android.os.IBinder remote)
{
mRemote = remote;
}
public android.os.IBinder asBinder()
{
return mRemote;
}
public Java.lang.String getInterfaceDescriptor()
{
return DESCRIPTOR;
}
public void perforMaction() throws android.os.RemoteException
{
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
try {
_data.writeInterfaceToken(DESCRIPTOR);
mRemote.transact(Stub.TRANSACTION_perforMaction, _data, _reply, 0);
_reply.readException();
}
finally {
_reply.recycle();
_data.recycle();
}
}
}
static final int TRANSACTION_perforMaction =
(IBinder.FIRST_CALL_TRANSACTION + 0);
}
public void perforMaction() throws android.os.RemoteException;
}
文件forService.Java：
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·········10········20········30········40········50········60········70········80········90········100·······110·······120·······130·······140·······150/*
* This file is auto-generated. DO NOT MODIFY.
* Original file: D:\\workspace\\AIDLTest\\src\\com\\styleflying\\AIDL\\forService.aidl
*/
package com.styleflying.AIDL;
import Java.lang.String;
import android.os.RemoteException;
import android.os.IBinder;
import android.os.IInterface;
import android.os.Binder;
import android.os.Parcel;
public interface forService extends android.os.IInterface
{
/** Local-side IPC implementation stub class. */
public static abstract class Stub extends android.os.Binder implements com.styleflying.AIDL.forService
{
private static final Java.lang.String DESCRIPTOR = "com.styleflying.AIDL.forService" ;
/** Construct the stub at attach it to the interface. */
public Stub()
{
this .attachInterface( this , DESCRIPTOR);
}
/**
* Cast an IBinder object into an forService interface,
* generating a proxy if needed.
*/
public static com.styleflying.AIDL.forService asInterface(android.os.IBinder obj)
{
if ((obj== null )) {
return null ;
}
android.os.IInterface iin = (android.os.IInterface)obj.queryLocalInterface(DESCRIPTOR);
if (((iin!= null )&&(iin instanceof com.styleflying.AIDL.forService))) {
return ((com.styleflying.AIDL.forService)iin);
}
return new com.styleflying.AIDL.forService.Stub.Proxy(obj);
}
public android.os.IBinder asBinder()
{
return this ;
}
@Override public boolean onTransact( int code, android.os.Parcel data, android.os.Parcel reply, int flags) throws android.os.RemoteException
{
switch (code)
{
case INTERFACE_TRANSACTION:
{
reply.writeString(DESCRIPTOR);
return true ;
}
case TRANSACTION_registerTestCall:
{
data.enforceInterface(DESCRIPTOR);
com.styleflying.AIDL.forActivity _arg0;
_arg0 = com.styleflying.AIDL.forActivity.Stub.asInterface(data.readStrongBinder());
this .registerTestCall(_arg0);
reply.writeNoException();
return true ;
}
case TRANSACTION_invokCallBack:
{
data.enforceInterface(DESCRIPTOR);
this .invokCallBack();
reply.writeNoException();
return true ;
}
}
return super .onTransact(code, data, reply, flags);
}
private static class Proxy implements com.styleflying.AIDL.forService
{
private android.os.IBinder mRemote;
Proxy(android.os.IBinder remote)
{
mRemote = remote;
}
public android.os.IBinder asBinder()
{
return mRemote;
}
public Java.lang.String getInterfaceDescriptor()
{
return DESCRIPTOR;
}
public void registerTestCall(com.styleflying.AIDL.forActivity cb) throws android.os.RemoteException
{
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
try {
_data.writeInterfaceToken(DESCRIPTOR);
_data.writeStrongBinder((((cb!=null ))?(cb.asBinder()):( null )));
mRemote.transact(Stub.TRANSACTION_registerTestCall, _data, _reply, 0 );
_reply.readException();
}
finally {
_reply.recycle();
_data.recycle();
}
}
public void invokCallBack() throws android.os.RemoteException
{
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
try {
_data.writeInterfaceToken(DESCRIPTOR);
mRemote.transact(Stub.TRANSACTION_invokCallBack, _data, _reply, 0 );
_reply.readException();
}
finally {
_reply.recycle();
_data.recycle();
}
}
}
static final int TRANSACTION_registerTestCall = (IBinder.FIRST_CALL_TRANSACTION + 0 );
static final int TRANSACTION_invokCallBack = (IBinder.FIRST_CALL_TRANSACTION + 1 );
}
public void registerTestCall(com.styleflying.AIDL.forActivity cb) throws android.os.RemoteException;
public void invokCallBack() throws android.os.RemoteException;
}
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·········10········20········30········40········50········60········70········80········90········100·······110·······120·······130·······140·······150/*
* This file is auto-generated. DO NOT MODIFY.
* Original file:
D:\\workspace\\AIDLTest\\src\\com\\styleflying\\AIDL\\forService.aidl
*/
package com.styleflying.AIDL;
import Java.lang.String;
import android.os.RemoteException;
import android.os.IBinder;
import android.os.IInterface;
import android.os.Binder;
import android.os.Parcel;
public interface forService extends android.os.IInterface
{
/** Local-side IPC implementation stub class. */
public static abstract class Stub extends android.os.Binder implements
com.styleflying.AIDL.forService
{
private static final Java.lang.String DESCRIPTOR =
"com.styleflying.AIDL.forService";
/** Construct the stub at attach it to the interface. */
public Stub()
{
this.attachInterface(this, DESCRIPTOR);
}
/**
* Cast an IBinder object into an forService interface,
* generating a proxy if needed.
*/
public static com.styleflying.AIDL.forService
asInterface(android.os.IBinder obj)
{
if ((obj==null)) {
return null;
}
android.os.IInterface iin =
(android.os.IInterface)obj.queryLocalInterface(DESCRIPTOR);
if (((iin!=null)&&(iin instanceof
com.styleflying.AIDL.forService))) {
return ((com.styleflying.AIDL.forService)iin);
}
return new com.styleflying.AIDL.forService.Stub.Proxy(obj);
}
public android.os.IBinder asBinder()
{
return this;
}
@Override public boolean onTransact(int code, android.os.Parcel data,
android.os.Parcel reply, int flags) throws android.os.RemoteException
{
switch (code)
{
case INTERFACE_TRANSACTION:
{
reply.writeString(DESCRIPTOR);
return true;
}
case TRANSACTION_registerTestCall:
{
data.enforceInterface(DESCRIPTOR);
com.styleflying.AIDL.forActivity _arg0;
_arg0 =
com.styleflying.AIDL.forActivity.Stub.asInterface(data.readStrongBinder());
this.registerTestCall(_arg0);
reply.writeNoException();
return
true;
}
case TRANSACTION_invokCallBack:
{
data.enforceInterface(DESCRIPTOR);
this.invokCallBack();
reply.writeNoException();
return true;
}
}
return super.onTransact(code, data, reply, flags);
}
private static class Proxy implements com.styleflying.AIDL.forService
{
private android.os.IBinder mRemote;
Proxy(android.os.IBinder remote)
{
mRemote = remote;
}
public android.os.IBinder asBinder()
{
return mRemote;
}
public Java.lang.String getInterfaceDescriptor()
{
return DESCRIPTOR;
}
public void registerTestCall(com.styleflying.AIDL.forActivity cb) throws
android.os.RemoteException
{
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
try {
_data.writeInterfaceToken(DESCRIPTOR);
_data.writeStrongBinder((((cb!=null))?(cb.asBinder()):(null)));
mRemote.transact(Stub.TRANSACTION_registerTestCall, _data, _reply, 0);
_reply.readException();
}
finally {
_reply.recycle();
_data.recycle();
}
}
public void invokCallBack() throws android.os.RemoteException
{
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
try {
_data.writeInterfaceToken(DESCRIPTOR);
mRemote.transact(Stub.TRANSACTION_invokCallBack, _data, _reply, 0);
_reply.readException();
}
finally {
_reply.recycle();
_data.recycle();
}
}
}
static final int TRANSACTION_registerTestCall =
(IBinder.FIRST_CALL_TRANSACTION + 0);
static final int TRANSACTION_invokCallBack =
(IBinder.FIRST_CALL_TRANSACTION + 1);
}
public void registerTestCall(com.styleflying.AIDL.forActivity cb) throws
android.os.RemoteException;
public void invokCallBack() throws android.os.RemoteException;
}
/*
* This file is auto-generated. DO NOT MODIFY.
* Original file:
D:\\workspace\\AIDLTest\\src\\com\\styleflying\\AIDL\\forService.aidl
*/
package com.styleflying.AIDL;
import Java.lang.String;
import android.os.RemoteException;
import android.os.IBinder;
import android.os.IInterface;
import android.os.Binder;
import android.os.Parcel;
public interface forService extends android.os.IInterface
{
/** Local-side IPC implementation stub class. */
public static abstract class Stub extends android.os.Binder implements
com.styleflying.AIDL.forService
{
private static final Java.lang.String DESCRIPTOR =
"com.styleflying.AIDL.forService";
/** Construct the stub at attach it to the interface. */
public Stub()
{
this.attachInterface(this, DESCRIPTOR);
}
/**
* Cast an IBinder object into an forService interface,
* generating a proxy if needed.
*/
public static com.styleflying.AIDL.forService
asInterface(android.os.IBinder obj)
{
if ((obj==null)) {
return null;
}
android.os.IInterface iin =
(android.os.IInterface)obj.queryLocalInterface(DESCRIPTOR);
if (((iin!=null)&&(iin instanceof
com.styleflying.AIDL.forService))) {
return ((com.styleflying.AIDL.forService)iin);
}
return new com.styleflying.AIDL.forService.Stub.Proxy(obj);
}
public android.os.IBinder asBinder()
{
return this;
}
@Override public boolean onTransact(int code, android.os.Parcel data,
android.os.Parcel reply, int flags) throws android.os.RemoteException
{
switch (code)
{
case INTERFACE_TRANSACTION:
{
reply.writeString(DESCRIPTOR);
return true;
}
case TRANSACTION_registerTestCall:
{
data.enforceInterface(DESCRIPTOR);
com.styleflying.AIDL.forActivity _arg0;
_arg0 =
com.styleflying.AIDL.forActivity.Stub.asInterface(data.readStrongBinder());
this.registerTestCall(_arg0);
reply.writeNoException();
return
true;
}
case TRANSACTION_invokCallBack:
{
data.enforceInterface(DESCRIPTOR);
this.invokCallBack();
reply.writeNoException();
return true;
}
}
return super.onTransact(code, data, reply, flags);
}
private static class Proxy implements com.styleflying.AIDL.forService
{
private android.os.IBinder mRemote;
Proxy(android.os.IBinder remote)
{
mRemote = remote;
}
public android.os.IBinder asBinder()
{
return mRemote;
}
public Java.lang.String getInterfaceDescriptor()
{
return DESCRIPTOR;
}
public void registerTestCall(com.styleflying.AIDL.forActivity cb) throws
android.os.RemoteException
{
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
try {
_data.writeInterfaceToken(DESCRIPTOR);
_data.writeStrongBinder((((cb!=null))?(cb.asBinder()):(null)));
mRemote.transact(Stub.TRANSACTION_registerTestCall, _data, _reply, 0);
_reply.readException();
}
finally {
_reply.recycle();
_data.recycle();
}
}
public void invokCallBack() throws android.os.RemoteException
{
android.os.Parcel _data = android.os.Parcel.obtain();
android.os.Parcel _reply = android.os.Parcel.obtain();
try {
_data.writeInterfaceToken(DESCRIPTOR);
mRemote.transact(Stub.TRANSACTION_invokCallBack, _data, _reply, 0);
_reply.readException();
}
finally {
_reply.recycle();
_data.recycle();
}
}
}
static final int TRANSACTION_registerTestCall =
(IBinder.FIRST_CALL_TRANSACTION + 0);
static final int TRANSACTION_invokCallBack =
(IBinder.FIRST_CALL_TRANSACTION + 1);
}
public void registerTestCall(com.styleflying.AIDL.forActivity cb) throws
android.os.RemoteException;
public void invokCallBack() throws android.os.RemoteException;
}
兩段代碼差不多，前面基本一樣，從後面看，最後跟著我們在AIDL中自定義的方法，沒有實現。兩個文件各定義一個了接口，這兩個接口分別會在 Activity和Service中使用，在那裡我們將實現自定義的方法。兩個接口中都定義了一個抽象類Stub，實現所在的接口。Stub中又有一個類 Proxy。Stub中有一個static的asInterface()方法，裡面有很多return語句，在mAIDLActivity中調用它時，它返回一個新創建的內部類Proxy對象。
這個Stub對我們來說很有用，它繼承了Binder。Binder有什麼用呢？一個類，繼承了Binder，那麼它的對象就可以被遠程的進程使用了(前提是遠程進程獲取了這個類的對象【對象的引用】，至於如如何獲得看下文)，在本例中就是說，如果一個Service中有一個繼承了Stub的類的對象，那麼這個對象中的方法就可以在Activity中使用，對Activity也是這樣。至於Binder的細節，網上有很多貼介紹，看不明白也不影響我們完成這個例子。
從開放封閉觀點看 iOS vs Android
最近因為因緣際會，看了好些與創新理論相關的書籍。其中創新理論權威、哈佛大學商學院教授克裡斯汀生所著《創新者的解答》一書，我個人認為頗有意思，尤其對於開放系統與封閉系
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